Rotary safety-razor.



A. MoK. RANKIN.

ROTARY SAFETY RAZOR.

APPLICATION FILED MAR. 12, 1908.

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APPLICATION FILED KAB.12, 1908.

Patented June 29, 1909.

2 SHEETS-SHEET 2.

INVENTOR. W m

J ATTORJVEY.

UNITED STATES PATENT OFFICE.

ARTHUR McKEE RANKIN, OF TYNGSBORO, MASSACHUSETTS.

ROTARY SAFETY-RAZOR.

To all whom it may concern:

Be it knoWint-hat I, ARTHUR MoKEE RAN- uN, a citizen-of the United States, residing at Tyngsboro, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Rotary Safety-Razors, of which the followmg is a specification.

My invention relates to improvements in rotary safety razors.

The object of my invention is to provide a razor with which the beard may be quickly and closely shaved without discomfort or danger to the person shaved.

In its preferable form my invention provides a motor frame carrying a motor and one or more revolving razor blades, suitable means being provided by which the motor in running causes revolution of the blades.

My invention provides further novel means by which the razor blades are held from too close contact with the skin, thereby preventing too close shaving or cutting of the skin.

My invention further provides novel means for detachably securing the razor blades to the rotary sup orting means.

My invention provi es still further a handle for the motor frame, said handle for the convenience of the operator being adjustable to diflerent positions relative to the motor frame.

Other novel features of my invention are hereinafter fully described and claimed.

In the accompanying drawings illustrative of a preferred form of my invention, Figure 1 is a plan view of my improved rotary razor, of the form having an electric motor as the power for revolving the razor blades. Fig. 2 is a vertical sectional view taken on the broken dotted line ab of Fig. 5. Fig. 3 is a sectional view taken on the dotted line cd of Fig. 1. Fig. 4 is a side elevation. on the dotted line ef of Fig. 2. Fig. 6 is a cross section taken on the dotted line g-.h of Fig. 5. Fi 7 is an enlarged detail, in cross section, 0 a portion of one of the razor blades and the depth guard attached thereto.

Similar characters of reference denote similar parts.

Specification of Letters Patent.

Application filed March 12, I908.

Fig. '5 is a cross section taken Patented June 29, 1909.

Serial No. 420,672.

comfpactness, cleanliness and convenience, I pre er to employ an electric motor, the casing or frame of which, denoted by 1, serves as a support for the rotary blade supporting means. The motor frame or casing 1 is provided with two parallel arms 2, the outer ends of which are provided with longitudinal slots 3 through which extend respectively two bearings 4, in which is rotatively mounted a transverse shaft 5, which carries the blade supporting means comprising the following described parts :Intermediate the arms 2, on the shaft 5, are ri 'dly secured two collars 6, each provide with a series of radial arms 7 having flattened outer ends upon which are rigidly secured, rallel with the shaft 5, a plurality of mar lates 8 having the general form of t e or mary guard plate usually employed in common safety razors. Each guard plate 8, adjacent its outer edge, is provided with a series of transverse slots 9 and the outer edge of each guard plate is curved inwardly as shown in Fig. 5, so as to not catch or dig into the skin. Each guardplate 8, as shown in Fig. 5, is provided on its inner edge with a longitudinal right angled portion 9. The razor blades 10 are detachably mounted upon the outer sides respectively of the guard plates 8 to which they are detachably secured by channel shaped plates or members 11, WlllCh embrace eaoh the inner edges of the right angled portion '9 and blade 10. Each ard plate 8 is provided on its outer side, ad acent its outer edge and at its ends, with projections 12 which engage the ends and beveled outer edges of the blades 10, thereby holding the blades at their outer edges close to the guard plates 8., Secured to each radial arm 7 is a spring 13, the free outer end of which bears against the adjacent channel shaped member 11 and holds the said plate releasably engaged with the blade 10 and blade 8' to ,which it is connected; When it is desired to remove a blade the spring plates 13 are sprung away from the guard plate8, thereby permitting the channe plates 11 to be removed, after which the blades 10 are slid inwardly out of engagement with the projections 12.

In order to prevent longitudinal movement of the channel members 11, each of these members isprovided with three projections 14, which enter recesses 15 provided therefor in the right angled portion 9 of the guard plates 8.

' which is adapted to bear against the adjacent end of a friction disk 20, which is fitted to and longitudinally slidable on the squared outer end of the armature shaft 21, which 1s rotatively mounted in the casing or frame 1.

A coil spring 22 encircles the shaft 21 and has one end bearing against the inner end of the friction disk 20 and its other end bearing against a plate 23, mounted on the shaft 21 and bearing at its inner end against the shoulder 24 on the shaft 21. The function of the spring 22 is to retain the friction disks 19 and 20 in driving engagement with each other. Mounted upon and rotative with the shaft 5 are two pulleys 25, which are connected respectlvely by belts 26 to two pulleys 27 rigidly secured on the shaft 18. At opposite sides of the casing 1, parallel with the shaft 4, are provided two screw threaded projections 28, on which are pivoted respectively the two diverging arms 29 of a handle 30. Fitted on the projections 28 are thumb nuts 31 by which the arms 29 of the handle 30 may be rigidly clamped against the casing or frame 1. By loosening the nuts 31 the handle 30 may be swung to any position deslred and then locked in said position by tightening the nuts.

In order that the guard plates 8 and blades 10 may be retained or held from too close contact with the skin, supporting guards are provided, consisting preferably of two circular disks 32, which are preferably disposed concentric with the axis of revolution of the blades 10, and which are preferably rotatively mounted on the shaft 5, at opposite ends of the blades 10.

33 denotes the flexible cord which preferably extends longitudinally through the handle 30 and into the casing or frame 1, andwhich carries the conducting wires 34, which carry the electric current to and from the motor, which is mounted in the casing. Any suitable type of electric motor may be employed and the shape and construction of the casing or frame 1 may be modified in many particulars.

In operating my improved safety razor of the form shown and described, current is applied to the motor through the wires 34, thus causing rotation of the'motor shaft 21 and thereby transmitting rotation from said shaft to the shaft 5 through the interme- The blades 10 in revolving will cut the beard, 5

the guard plates 8 preventing too close contact of the blades with the skin. At any time when it is desired to tighten the belts 26, this may be done by loosening the nuts 17 and then moving the bearings 4 away from the shaft 18 to positions in which the belts 26 will be tight. The nuts 17 are then-tightened so as to secure the bearings 4 in the positions to which they have been adjusted.

The handle 30, as "above described, may be adjusted to such positions as suit the convenience of the operator. The blades 10 may be readily removed for sharpening or replacing with others, as has already been describe My invention may be modified in many ways, within the scopeof the appended claims, without departing from its spirit.

Having thus described my invention what I claim and desire to secure by Letters Patent, is

1. In a rotary razor, the combination with a support adapted to be manipulated, of

blade supporting means rotatively mounted on said support, one or more blades carried by said blade supporting means, and two circular supporting guards carried on said support concentrically with the axis of revolution of said blades, and dis osed respectively at opposite ends of said lades.

2. In a rotary razor, the combination with a support adapted to be manipulated, of blade supporting means rotatively mounted on said support, one or more blades carried by said blade supporting means, and two circular supporting guards carried by said support at opposite ends respectively of said blades and 'rotative around the axis of revolution of said blades. t

' 3. In a rotary razor, the combination with a motor frame, of a handle secured thereto and adjustable thereon to different positions, a motor shaft rotatively mounted on said frame, one or more razor blades, blade supporting means rotatively mounted on said motor frame and supporting said razor blades and having one or more depth guards coi perating respectively with said blades, and means for transmitting rotation from said motor shaft to said blade supporting means. 7 p

4. In a rotary razor, the combination with a support adapted to be manipulated, of one or more razorblades, blade supporting means carrying said blades and rotatively mounted on said support and provided with one or more depth guards cotiperating respectively with said blades, two circular supporting guards carried by said support concentrically with the axis of revolution of said blades and at opposite ends respectively of said blades, and means for rotating said blade supporting means.

5. In a rotary razor, the combination with a motor frame, of a motor shaft rotatively mounted thereon, one or more razor blades, blade supporting means carrying said blades and rotatively mounted on said frame and having one or more depth guards cooperating respectively with said blades, circular supporting guards mounted on said frame concentrically with the axis of revolution of said blades, and driving means connecting said shaft and supporting means.

6. In a rotary razor, the combination with a motor frame, of a motor shaft rotatively mounted thereon, one or more razor blades,

blade supporting means carrying said blades and rotatively mounted on said frame and having one or more depth guards cooperating respectively with said blades, two circular supporting guards rotatively mounted on said frame concentrically with the axis of revolution of said blades and disposed respectively at opposite ends of said blades, and driving means connecting said motor shaft and blade supporting means.

7. In a rotary razor, the combination with a motor frame, of a handle secured to and adjustable to different positions thereon, a motor shaft rotatively mounted on said motor frame, one or more razor blades, blade supporting means carrying said blades and rotatively mounted on said frame and having one or more depth guards cooperating respectively with said blades, two circular supporting guards carried by said motor frame concentrically with the axis of revolution of said blades, and means for transmitting rotation from said motor shaft to said blade supporting means.

8. In a rotary razor, the combination with a blade support provided With a depth guard, of a razor blade mounted on said support and cooperating with said depth guard, a channel shaped member for embracing and securing together the razor blade and blade support and detachable therefrom, and releasable means for holding said channel shaped member in engagement with said blade and blade support.

In testimony whereof I have signed my name to this specification in presence of two subscribing witnesses.

ARTHUR \Vitnesses VILLIAM FITZGERALD, h'IAmn BURKART.

MCKEE RANKIN. 

